Would you say that the UUC is considerably better than this one? And is this one considerable better than stock?

Sale pending on the item (will let you know if it falls through) but I'll still answer your questions.

The UUC is shorter (which I personally find better) but it is notchy and takes a lot of effort. This one is as smooth as stock but with a noticeably shorter throw, albeit not as short as the UUC. This one is also much cheaper than the UUC.